O-Benzyl-N,N'-diisopropylisourea

Traditional methods for benzyl ester formation — such as treatment of carboxylic acids with benzyl bromide and a base, or with benzyl alcohol under Mitsunobu conditions — can be plagued by side reactions (elimination, racemization) and/or require harsh conditions. O-Benzyl-N,N'-diisopropylisourea provides a superior alternative, offering a fundamentally different mechanistic path. In the presence of a carboxylic acid, O‑Benzyl‑N,N'‑diisopropylisourea acts as a dehydrating agent via its isourea moiety, facilitating the formation of a reactive O‑acylisourea intermediate that is then attacked by the carboxylate anion to yield the benzyl ester. With O-Benzyl-N,N'-diisopropylisourea, the byproduct, N,N′‑diisopropylurea, is typically soluble in organic solvents, simplifying purification to a simple filtration or aqueous wash. Critically, the reaction proceeds without racemization at α‑chiral centers, making O‑Benzyl‑N,N'‑diisopropylisourea indispensable for the synthesis of chiral molecules, including complex natural products and pharmaceutical intermediates.

Product Parameters

Why Use O-Benzyl-N,N'-diisopropylisourea?

Synthesis Note

BDIU is prepared by the reaction of N,N'-diisopropylcarbodiimide (DIC) with benzyl alcohol. The synthesis is straightforward and scalable, but for routine research applications, Cosperpharm offers the reagent in high purity, ready for immediate use.

Quality Assurance at Cosperpharm

Each batch undergoes:

● Gas chromatography (GC) – purity ≥97.0%

● Non‑aqueous titration – purity ≥97.0%

● Refractive index – confirmatory analysis

● ¹H NMR – structural verification

● Appearance – colorless to light yellow to light orange clear liquid

A comprehensive COA, MSDS (with full GHS information), and certificate of origin accompany every shipment.

Frequently Asked Questions (FAQ)

Q1: How does BDIU compare to O-Benzyl-N,N'-diisopropylisourea?

A: The key difference lies in the amine substituents. BDIU uses isopropyl groups, whereas the dicyclohexyl analogue uses cyclohexyl groups. The N,N'‑diisopropylurea byproduct from BDIU is generally more soluble in organic solvents and easier to remove by filtration or aqueous workup compared to N,N'‑dicyclohexylurea, which can be less soluble and sometimes precipitates. BDIU is therefore often the preferred reagent when purification is a primary concern.

Q2: What is the typical procedure for benzyl esterification using BDIU?

A: A general procedure: dissolve the carboxylic acid (1.0 equiv) in an inert solvent such as toluene, DCM, or THF. Add BDIU (1.1–1.5 equiv) and warm to 40–80 °C for 2–12 hours. Monitor by TLC. Upon completion, cool the mixture, filter off any precipitated urea, and concentrate the filtrate. Purify by flash chromatography or recrystallization. For acid‑sensitive substrates, running the reaction at room temperature for longer periods is also feasible.

Cosperpharm — Here’s How to Make This Reagent Yours

Need a reliable benzylating agent that won’t racemize your chiral substrate? Cosperpharm supplies O-Benzyl-N,N'-diisopropylisourea (CAS 2978‑10‑1) with verified purity and full documentation. Whether you need 1 mL for a reaction screen or 1 L for process development, we’re ready to deliver.